What are the rules for overloading functions in C++ function overloading?

C The rules for overloading functions are as follows: 1. The parameter list is different (number, type or order); 2. The number of parameters must be different; 3. The parameter types are different; 4. The parameter order is different; 5. const and reference qualifiers Does not affect reloading.

Rules for overloading functions in C function overloading

Function overloading is a powerful feature in the C language, which allows multiple functions with the same name Has different behavior depending on its argument list. In order to ensure the correct use of overloaded functions, the following rules need to be followed:

1. The parameter lists must be different

The parameter lists of overloaded functions must be in number and type Or the order is different. For example:

void print(int x);
void print(double y);

2. The number of parameters must be different

Functions with the same number of parameters cannot be overloaded. For example:

// 错误，参数数量相同
void print(int x, int y);
void print(int a, int b);

3. Parameter types must be different

Functions with the same number of parameters but different types can be overloaded. For example:

void print(const char* s);
void print(int x);

4. Parameter order must be different

Even if the type is the same, functions with different parameter order can be overloaded. For example:

void swap(int& x, int& y);
void swap(double& a, double& b);

5. const and reference qualifiers do not affect overloading

const and reference qualifiers do not affect function overloading. For example:

void print(const int& x);
void print(int& y);

Practical case

We can see the practical application of function overloading in the following example code:

#include <iostream>

using namespace std;

void print(int x) {
  cout << "Integer: " << x << endl;
}

void print(double y) {
  cout << "Double: " << y << endl;
}

int main() {
  print(10);  // 调用 print(int)
  print(3.14); // 调用 print(double)
  return 0;
}

Output:

Integer: 10
Double: 3.14

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